gf_time.c: remove dead assignment to 'elapsed'
gf_time.c: remove dead assignment to 'elapsed'

Signed-off-by: Danny Al-Gaaf <473e39ac77cf392f0dd9bacde8409de76c14d006@bisect.de>

cedricde/gf-complete,zzxuanyuan/gf-complete,zzxuanyuan/gf-complete,ceph/gf-complete,ceph/gf-complete,ceph/gf-complete,cedricde/gf-complete